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I know of WAI but it's not that simple with Previa. It has engine in the middle and air intake under the bonnet. So to grab some hot air for the intake I'd need to use pretty long pipe, then hot air won't be so hot anymore if it has to travel from the engine to the front of the car, then go back trough another long tunnel to the intake. But intake mainfold is pretty long, it's made of aluminium, and it's placed above the engine so air entering the combustion chamber is pre-warmed anyway. My plan is to insulate engine a bit more so it will run slightly warmer than it used to. Hope it will help my FE.
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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